>Being a Super Saiyan doesn't mean much if you don't have a job.
Practically anyone off of the cast of Dragon Ball Z could make a shit load of money doing construction/demolition work.
>pay Goku a lump sum to blast a fucking tunnel through a mountain
>build some reinforcements
>you now connected a isolated city with a new pathway that would have taken years to build
Gohan would probably be an amazing engineer if he didn't stop training and utilized his powers for land development. He'd be a literal one man wrecking crew.